How Many Watts in a Car Battery?
Ampere-hours measure the amount of charge that a battery can store, while watt-hours measure the amount of energy that a battery can deliver. To calculate watt-hours, you need to multiply the voltage by the ampere-hours. For example, a 12-volt car battery with a capacity of 50 Ah can store 600 watt-hours of energy (12 × 50 = 600).